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Karlsson, Oskar, 2022. Effects on natural seed regenerated Silver birch (Betula pendula Roth) and Downey birch (Betula pubescens Ehrh) by mechanical soil scarification and environmental factors : påverkan på naturligt fröföryngrad Glasbjörk (Betula pubescens Ehrh) och Hängbjörk (Betula pendula Roth) av mekanisk markberedning och omgivande faktorer. Second cycle, A2E. Umeå: SLU, Dept. of Forest Ecology and Management

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Abstract

The awareness of forest biodiversity as well as the demand for a higher proportion of deciduous tree species in Swedish forests increases. As such, focus is shifting towards the management of naturally seed regenerated Silver birch (Betula pendula Roth) and Downey birch (Betula pubescens Ehrh). It is therefore essential to extend the knowledge of how birch seed regeneration is affected by management interventions as well as biotic and abiotic environmental factors. I selected 20 sites in northern Sweden that had been clear-cut between 2014 – 2019. Half of the sites had undergone mechanical scarification within two years after clear-cut. On all sites, a selection of biological, edaphic, and geographical factors along with naturally seed regenerated birch seedlings and saplings present were inventoried using a quadratic systematic grid of plots. Results showed that there was a trend towards a higher number of birch seedlings and saplings on not scarified sites. Also on not scarified sites, there were significantly shorter distances to seed trees and higher moss coverage in comparison to scarified sites, which according to correlation analysis increased number of seed regenerated birch seedlings and saplings. This work illuminates the importance of regarding multiple factors when regenerating birch by seed. Further research that captures the effect by a wide selection of biotic and abiotic environmental factors together with management interventions on birch seed regeneration is needed.

Main title:Effects on natural seed regenerated Silver birch (Betula pendula Roth) and Downey birch (Betula pubescens Ehrh) by mechanical soil scarification and environmental factors
Subtitle:påverkan på naturligt fröföryngrad Glasbjörk (Betula pubescens Ehrh) och Hängbjörk (Betula pendula Roth) av mekanisk markberedning och omgivande faktorer
Authors:Karlsson, Oskar
Supervisor:Nilsson Hegethorn, Marie-Charlotte and Nilsson, Sara
Examiner:Ilstedt, Ulrik
Series:Examensarbeten / SLU, Institutionen för skogens ekologi och skötsel
Volume/Sequential designation:2022:04
Year of Publication:2022
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SY001 Forest Science - Master's Programme 300 HEC
Supervising department:(S) > Dept. of Forest Ecology and Management
Keywords:natural birch regeneration, Birch seed regeneration, soil scarification
URN:NBN:urn:nbn:se:slu:epsilon-s-17510
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-17510
Subjects:Forestry production
Language:English
Deposited On:14 Feb 2022 09:15
Metadata Last Modified:15 Feb 2022 02:00

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